linux-kernel - Re: [PATCH v4 0/8] asm-generic/io.h overhaul

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Message-ID: <20140825112630.GA4163@ulmo.nvidia.com>
Date:	Mon, 25 Aug 2014 13:26:33 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Sam Ravnborg <sam@...nborg.org>,
	linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
	x86@...nel.org, linux-serial@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/8] asm-generic/io.h overhaul

On Wed, Aug 13, 2014 at 12:28:50PM +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> Hi,
> 
> Here is the fourth version of a series that started out as an attempt to
> provide string versions of the read*() and write*() accessors to more
> architectures so that drivers can use them portably. The series has
> since evolved into a more general cleanup of asm-generic/io.h and the
> functions defined therein.
> 
> Patch 1 is trivial and removes a redundant redefinition of PCI_IOBASE
> from the asm/io.h header on ARC. Patches 2 and 3 remove unnecessary
> volatile keywoards from some functions, which is a prerequisite to clean
> up some of the functions in subsequent patches.
> 
> The xlate_dev_{kmem,mem}_ptr() functions are used to map memory when the
> /dev/mem device is accessed. Patches 4 and 5 use more consistent data
> types for these functions, which will get a "standard" prototype in the
> asm-generic/io.h header in a subsequent patch.
> 
> Patch 6 is the bulk of this series. It implements the string variants of
> the read*() and write*() accessors and cleans up various other parts of
> the asm-generic/io.h header file. Macros are converted to static inline
> functions for better type checking. Overriding generic implementations
> in architectures is handled more consistently.
> 
> Patches 7 and 8, finally, make use of the asm-generic/io.h header on the
> 32-bit and 64-bit ARM architectures.
> 
> This is compile- and runtime-tested on 32-bit and 64-bit ARM and compile
> tested on IA64, Microblaze, s390, SPARC, x86 and Xtensa. For ARC,
> Blackfin, Metag, OpenRISC, Score and Unicore32 which also use
> asm-generic/io.h I couldn't find or build a cross-compiler that would
> run on my system. But by code inspection they shouldn't break with this
> patch.
> 
> To ensure bisectability I built multi_v7_defconfig on 32-bit ARM and the
> defconfig for 64-bit ARM, IA64, Microblaze, s390, SPARC, x86 and Xtensa
> after each commit and verified that the series does not introduce any
> build errors or warnings.
> 
> Provided there are no objections to the patches there's still the matter
> of how to merge them. Patch 6 depends on patches 1-5 to avoid warnings
> and/or errors during the build. Patches 7 and 8 depend on patch 6. In my
> opinion it doesn't make much sense to split them up, so I guess we'll
> need a volunteer to take them all into one tree. Ideally that tree would
> feed into linux-next so that we can get as much build and test-coverage
> as possible during the 3.17 release cycle so that these patches can go
> into 3.18.
> 
> Arnd, I'm opportunistically sending this To: you in the hopes that you
> can take it into your asm-generic tree which seems like the best fit for
> this.
> 
> Thierry
> 
> Thierry Reding (8):
>   ARC: Remove redundant PCI_IOBASE declaration
>   serial: sunzilog: Remove unnecessary volatile keyword
>   sparc: Remove unnecessary volatile usage
>   [IA64] Change xlate_dev_{kmem,mem}_ptr() prototypes
>   /dev/mem: Use more consistent data types
>   asm-generic/io.h: Implement generic {read,write}s*()
>   ARM: Use include/asm-generic/io.h
>   arm64: Use include/asm-generic/io.h
> 
>  arch/arc/include/asm/io.h       |   2 -
>  arch/arm/include/asm/io.h       |  75 ++---
>  arch/arm/include/asm/memory.h   |   2 +
>  arch/arm64/Kconfig              |   1 -
>  arch/arm64/include/asm/io.h     | 122 ++-----
>  arch/arm64/include/asm/memory.h |   2 +
>  arch/ia64/include/asm/uaccess.h |  16 +-
>  arch/s390/include/asm/io.h      |   5 +-
>  arch/s390/mm/maccess.c          |   4 +-
>  arch/sparc/include/asm/io_32.h  |  18 +-
>  arch/x86/include/asm/io.h       |   4 +-
>  arch/x86/mm/ioremap.c           |   4 +-
>  drivers/char/mem.c              |  13 +-
>  drivers/tty/serial/sunzilog.h   |   8 +-
>  include/asm-generic/io.h        | 683 ++++++++++++++++++++++++++++++++--------
>  15 files changed, 647 insertions(+), 312 deletions(-)

Arnd, do you think this looks good to take for test-driving in
linux-next?

Thierry

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